Exposure to chemicals biggest cause of breast cancer 
LONDON - Canadian scientists that exposure to materials and certain chemical pollutants before the woman reaches her mid-thirties, may increase the risk of breast cancer three times the rate of infection after menopause.
In a study published on Thursday in the journal Occupational and Environmental Medicine of the British Medical Journal, researchers found that women who are victims of industrial fibers and petroleum products through their work are the most vulnerable, it said.
They wrote "exposure at work to acrylic fibers, nylon and polycyclic aromatic hydrocarbons may increase the risk of breast cancer in post-menopause."
But some experts who are reacting to the study were cautious, saying that such linkages may occur by chance.
David Cajon Professor Occupational and Environmental Medicine at the University of Southampton in the UK "in this kind of study, positive correlation occurs by chance ... read" studies "do not matter in the absence of stronger evidence from other research."
Canadian scientists acknowledged that the outcome of the study may be a coincidence, but said also that it is consistent with the theory that breast tissue is more sensitive to harmful chemicals if there is exposure to these substances while breast cells are still active in other words before they reach the women forties.
Was based on the researchers, led by Franz Abresch Research Institute of Occupational Health in Montreal, Canada, in their findings to the more than 1100 women, of whom 556 were diagnosed with their situation as breast cancer in 1996 and 1997 when she was aged between 50 and 75-year period they had experienced menopause.
Scientists said that there was a need for further detailed studies on specific chemicals to try to determine the role played by exposure to chemicals in breast cancer
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